I did repitch to a 9, not 8, and I had the other dimention wrong, it may be 12 X 9 I'm really not certain. In any case, the 9 works much better then the previous pitch (12). With the Beta 14 (13.5 HP) I can get to max rpm, and in smooth water be very close to, or at hull speed. Also much more punch in waves or counter current. I have not checked fuel consumption yet.